The obligation to train troops in international humanitarian law (IHL) is simply stated and its implementation delegated to State discretion. This reflects a past assumption that mere dissemination of IHL would be an effective contribution to the prevention of violations. Academic literature has evolved so that dissemination alone is now known to be insufficient for compliance, while the ICRC's integration model emphasizes the relevance of IHL to all aspects of military decision-making. A separate process, the ICRC/Government of Switzerland Initiative on Strengthening Compliance with IHL, is still in its consultative stages at the time of writing, but may result in voluntary State reporting and/or thematic discussions at meetings of States. This article synthesizes academic and practitioner insights on effective IHL training, and suggests a collaborative rubric for informative, standardized reporting on IHL training. Such a rubric could enable States and researchers to share best practice and future innovations on IHL training, using a streamlined, cost-effective tool.